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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2446b9ea70895922ce01e2adc616205ceae358eb19dceb681dac965225e38a24' 
  AND token = '6BYOBiWyT4QIw/z3mraPdaoIrwOm63GbfNkyQNxghd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}